Silver ions and silver nanoparticles removal by coffee derived biochar using a continuous fixed-bed adsorption column

Efficient Separation of Uranium(VI) by CaCO3-Doped Chitosan with PO43– Modification: Adsorption Behaviors and Mechanism Study

“…The Thomas (k T ) and Yoon− Nelson (k YN ) kinetic constants increased with increasing flow rate, indicating the impact of hydrodynamic conditions and mass transfer on the model, which suggested that experimental conditions should be strictly controlled in dynamic adsorption studies. 55 Moreover, the dynamic theoretical adsorption capacity from the Thomas model was close to the static theoretical adsorption capacity from the Langmuir model, which further indicated that the Thomas model could reasonably and validity describe the dynamic adsorption process of CaCO 3 @aCS/PA for uranium. 56 For Yoon−Nelson dynamic adsorption models, t 50% decreased with the increase of flow rate, which could be explained by the insufficient contact time between uranium and active sites on CaCO 3 @aCS/PA.…”

“…The Thomas and Yoon–Nelson dynamic adsorption models were used to fit the dynamic adsorption data of CaCO 3 @aCS/PA for uranium (Figure c,d). The Thomas ( k T ) and Yoon–Nelson ( k YN ) kinetic constants increased with increasing flow rate, indicating the impact of hydrodynamic conditions and mass transfer on the model, which suggested that experimental conditions should be strictly controlled in dynamic adsorption studies . Moreover, the dynamic theoretical adsorption capacity from the Thomas model was close to the static theoretical adsorption capacity from the Langmuir model, which further indicated that the Thomas model could reasonably and validity describe the dynamic adsorption process of CaCO 3 @aCS/PA for uranium .…”

Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling

“…Approximately 359 billion cubic metres of wastewater are produced each year around the globe, out of which only 63% of the wastewater is collected and 52% is properly treated, while 48% of the wastewater remains untreated and subsequently released into the environment [1]. Wastewater generated from domestic and industrial sources is generally contaminated with potentially toxic heavy metals such as lead (Pb), chromium (Cr), cadmium (Cd), mercury (Hg), silver (Ag), and other hazardous pollutants [2,3]. Though several techniques are employed to remove the contaminants, including heavy metals, during the wastewater treatment process (WWTP), a major portion of heavy metals remains in the treated effluent that finally goes into the water bodies [4].…”